Hypodermic syringe



April 7', 1931. i G.' N. HEIN 1,799,453

HYPODERMIG SYRINGE Filed March 19., 192e-l 2 sneets-sheet 1v f@ Ulllllll,

lApril 7, 1931.

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G. N. HEHN HYPODERMIG SYRINGE Filed March 19, 1926 2 Sheexs-Shee'l 2 EA f 2 Patented pi. 1931 rss ,Y ITED ST l 1,7ea463e AT-ENT OFFI-E l v GEORGE N. HEIN, 0F sAN FRANeIsco,cALIFoRNIA Application led March 19, 1926. Serial No. 96,015,

stopper closure for containers such as con# ventional syringe barrels of Y rhypodermic syringesy and capable When it becomes stuck to the Walls of a container by long standing of being readily released from yits seat and of being easily operated to Withdraw it from 't or reciprocate it Within the container for dis-' charging all or a portion of the contents thereof and adapted also after such an operation to be .left in thecontainer as a stopper closure as Well Yas for operation for use as-a piston forv successive operations Where portions of the contents vof the con-k 'v the 4claims hereto appended, it being under` tainer are to be used at intervals. l

Another object of the invention-,is to reduce to a minimum lateral expansionof the piston head when force is applied in operating the same and by avoiding such lateral expansion to preventv the possibility of breaking the more lfragile containers and the sticking or excessive frictional resistance to the movement of the pistonin stronger containers of the metal orpyrex type. VThis object is accomplished by constructing the piston of solid material ground to fit its container snugly Vand at the same time be readilyv movable therein or by constructing the `piston head of materials of different density or degrees of hardness',v one material being elastic and the otherbeing partially elastic 0r non-elastic and serving as a core'for theelasf` tic material, the core being constructed to Ypresent to the Walls of the containera mm1- mum amount of the elastic material and thereby produce theleast possible frictional Contact be tween the piston fand the Walls of the container lconsistent With the function'- ing of the elastic material as a perfect packing. l

lA further object of the invention isfto providey means yfor readily connecting adetachable piston rod with the piston head to enable the latter to bey reciprocated lin the :container and also vto befreadily rotated axially therein by the piston to free the pis.-

ton head in case of thestieking ofthe lattery to the Walls of the container.

A further object of the invention-is to pro? vide a piston head of this character adapted for use in connection Witha solid piston rod or operating member and :also to enable the piston head tobe operatively connectedwith' a hollow piston rod or operating memberf adapted to contain ay medicant'or other solution capable of beingautomatioally released by the puncturing of a stopper closure of the hollow piston rod when the same is 'operated to connect it with the ypiston head. l

With thesey and other'objects in view, the

-invention consists inthe construction and novelcombination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed'out in stood that various changesin the form`,`pro portion and y'minor details of construction, Within the scope ofthe claims, may be re-A sorted to Withoutdeparting from the spirit. orsacriiicing any of the advantages ofthe invention. n

In the drawings :y v Figure l is a longitudinal sectional view of a hypodermic syringe piston constructed in accordance ,with this invention. F ig. 2 is a horizontal sectional view of the same on the line 2-2fofr F ig. l," 1 Y F ig. 3 is a vertical sectional view of a portion of a piston illustrating'another construction for detachably.. connecting the ,',piston headwith the Piston rod. f Fig. 4; is a detail view of a cylindrical elastic packing. j v Fig. 5 is a detail vieW of a cylindricalpacking in the form ofy a cap covering or closing the end of the piston hea v F ig. 6 a vertical sectional vieW'of a form of the invention in Which the piston head operates Within a container consisting of an ampule. i Fig? is a detail ysectional vievv of thepis# tonhead showing the elastic packing .before the same is punctured.

Fig. 8 is a detail sectional View showing another form of piston head. Y

Fig. 9 is a vertical longitudinal sectional Decting the nipple with the needle of the liy-r podermic syringe does not constitute a portion of they present invention illustration y vthereof is deemed unnecessary. In the form of the invention illustrated iii Figs. l and 2 the piston consists of a solid' piston rod or operating member 4 and a piston head composed of an inner inelastic core 5 and an elastic packing 6 which is arranged on the lower or outer portion of the core and which is referably in the form of a cap. The core 5 lias a solid lower packing receiving portion and it is provided with an upper hollow interiorly threaded sleeve or portion 7 into which: screws aL reduced threaded shank or stein 8 of the piston rod 4. Thelower end of the piston rodis reduced to form the shank or stem 8 and thelatter is threaded to provide the threaded connection S. between the piston rod. and thev piston. head. The pistonA rod isprovided at the upperl end of the siiank or stein with an annular shoulder 9 which abuts against the upper end .of the hollow portionV or sleeve 7 of the piston head and the piston rod is adapted to be readily screwed into and out of the threadedy socket or openinfg formed by theholllow portion or sleeve 7 o the core 5 of the piston head. ,This provides for a ready attachmentor connection of the iston. rod with the piston head and also ena les thepiston rod toaxially rotate the piston head to free the latter from.. the walls of the container 1 should the piston head by reason of long standing stick to the same. The upper end of the piston rod is shaped to form a handle 10 which is preferably in the form of aflat cylindrical portion or disk with the adjacent portion of the piston rody re-V ducedI and tapered as shown but any other suitable form of grip or handle may of course, be employed. j

The elastic packing or section of the pistonv head preferably covers the lower solid portion of the. core 5 and the said lowei` solid portion ofthe core is preferably reduced in diameter to form a horizontal. shoulder ll against which fits the upper edge of the elastic packing. The solid packing receiving portion ofl the core is provided with one or more annular ribs 12 extendingv entirely around the core and adapted to cause the elastic packing to form annular projecting ribs or portions which bear against and frictionally engage the walls of the container l to forni a liquid and air tight packing and a perfect packing engagement between the piston head and the walls of the container. rlhe annular ribs l2 are preferably substantially triangular in cross section and they are adapted to present to the walls of the container a minimum amount of the elastic packing material consistent with the production of a perfect packing or joint between the 'piston head and the walls of the container. `This will reduce to a minimum the frictional resistance of the packing tothe relative longi* tudinal movement of the piston and the container and insure perfect ease and accuracy in the operation of the hypoderinic syringe. The transverse end portion 13 of the piston packing may be providedv with a concave end face 14e as illustrated in Fig. l of the drawings or the end faceinay be of uniform diameter throughout its entire area as illustraten 'in Fig. 5 of the drawings. Also as shown in Fig. l of the drawings the elastic packing may be cylindrical with the outer end or closure omitted.

rlhe piston head is adapted to function as a stopper closure for the container as well as a piston head for expelling the contents of the container therefrom and when desired the piston rod or operating member may be uiiscrewed from the piston head and the latter will remain in frictional contact with the walls of the container and. provide an efficient closure for the saine. The container may be in the form of the conventional barrel l shown in Fig. l of the drawings or it may consist of an ampule or other container and the elasticity of the projecting annular ribs of the packing will amply compensate for any irregularities in theV manufacture of such containers. By utilizing the detachablegpiston head asa stopper closure for acontainer of this character the contents of such container may bev successfully used to advantage and the piston rod maybe disconnect-ed from the piston head after each operation and readily connected with the piston head for the next operation when required and the positive.

ventioii shown in Fig. 8 the core l5 which.

may be constructed of glass or any other suitable material similar to the core 5 consists of a cylindrical body yclosed at the outer end i nu lill

16 and provided with iiiteriorscrew threadsy 17 to .be engaged by theV threads of the reduced shank or stein 8 'of the piston rod 1. The upper edge ofthe cylindricalr core 15 lfits against the shoulder 9 of the piston rodand the said core 15 is provided with one or more exterior annular ribs 18 which are adapted to engage and cause annular protuberances toY be formed exteriorly of an elasticvpacking 19 which is shown open at the lower end and which has its upper end abutting against the shoulder 9 of the piston rod 1. The piston head illustrated in Fig. 3 of the drawings is adaptedto function similar to the piston head shown in Figs. land 2 in forming a closure for a receptacleand in operating as a ypiston head forexpelliiig the contents of the container or for sucking liquid into the same.

In Figs. 6 and 7 of the drawings is illustrated a formv of the invention in which the piston head is arranged within a container consisting ofan'ampule 20 having a closed lower end 21. Thepiston head consists yof a cylindrical core 22 constructed of glass or other suitable material and open at each end and provided at its lower portion with exterior annular ribs 23 adapted to cause exterior annular protuberances or ribs 24 exterior-ly of an elastic packing 2,5. The elastic packing is in the form of a substantially cylindrical cap provided with an outer transverse portion 26 having a central approximately semi-spherical portion'27 projecting inwardly intothe outer endof the cylindrical core and 'forming a concavo-convex` closure for the same. The ylower packing receiving portion of the core is exteriorly reduced to form a horizontal annular shoulder 28 located atan intermediate point between the upper and lcwerend of the core and providing an abutment for the upper edge oftheelastic packing25 which also abuts againstthey lower edge of the core. rlhe upper portion of the core is provided with interior screw threads 29 for engaging exterior screw threads 30fof a reduced lower portion or shank 31 of a couplingv section 32 constructed of glass or other suitable material.- The coupling section forms an upper member of 32 to form a shank 30 provides an abutment for theupper edge of the cylindrical core.

The coupling member has a body portion of the same diameter as the adjacent end ofthe core and the said body` portion is hollow and open at the upper end to provide a socket for lthe low-er threaded end 35 vof a piston 36, and it is interiorly threaded at 37 vto engage the said threaded end 35. The bottoni 38 of the socketis tapered or conical and the lower extremity of the piston is reduced to provide a cylindrical projection l39 whichis adapted to abut against the inclined walls of the lbottom of the socket of the coupling section or member 32 ofthe pis-` ton head.` The piston 36 is provided with a central longitudinal bore 40 fand. the couv plingl section is vprovided with a central Ylongitudinal bore41 located below and arranged in alignment with the bore 40 ofthe piston and extending through a puncturing needle or point 42 depending from the couplin sec-x tion 32 and tapered `downwardly as s own. and adapted when the coupling section is screwed into the upper threaded end of the cylindrical core to pierce or puncture the concavo-convex center of the transverse portion of the elastic packing and establish a communication between the bore or' passage 41 and the interior of thefampule 20. The bores 40 and 4l form passages'for the Vliquid contents of the ampulej and the piston rod or member 36 is operable to 4reciprocate the piston head and also to rotatethe saine axially to free the piston head in case of the same sticking in the ampule. The bore 4() ofthe piston .is n designed to communicate with a hypodermic needle 36A carried by the upper, end of the piston which will also be provided with va suitable grip 36B. The piston head is. adapted-to function as a stopper closure and will provide an air andliquid tight connection until the transverse portion of the packing is punctured-by the tapered needle` of the coupling member. is formedintegral with the lower portion of the coupling member and depends centrally from the same as shown. l

InF ig. 8 of the drawings is illustrated a slight modification of the core illustrated in Figs. 6 and 7 vof the drawings. In Figs. 6 and 7the lower portion of the core has a smooth interior and the upper portion is threadedtfor engaging the coupling member while in Fig. 8 of the drawings, the core 43 is shortened and is threaded interiorly at 44 substantially throughout its entire length. The core shown in, Fig.'8 is otherwise substantially the same as that' illustrated in Figs. 6 and 7 andthe operation is similar to .f that heretofore described. l

In F ig.V 9 of the drawings is illustrated a form of the .invention in which the piston yrod or operating member is in. the form of anampule 45 constructed ofv glass or other suitable material and arranged in an .inverted position within a container 46 and providedatl itslower end with a neck 47 exteriorly threaded at 48 and receiving a The tapered needlev v loo stopper closure 49 adapted. to be punctured by a needle or puncturing point 50 of they piston head. The neck is provided with an interior seat 51 for the stopper 49 and the latter vmay be constructedr of any suitable material yand-is preferably provided at its inner end with a recess 52 reducing the longitudinal thickness of the stopper at the'center thereof and `facilitating the piercing of the ystopper by the 'puncturing needle 50 y ofthe piston head. rlhe receptacle 46 is in the form of a conventional hypodermic syrl mediate horizontal ingle barrel and the hollow piston rod iits snugly within and is guided by the wallsof the container but has free longitudinal movementwithin the same.

The piston head comprises a core 58 constructed of glass or other suitable material andconsisting of a-'solid lower portion and a hollow upper portion or sleeve. The solid lower portion which receives an elastic packing 54 is provided'at its lower .end with an annular rib for producing in the elastic packing an exterior annular rib 55 or protuberance for frictionally engaging they walls of the container 46 but any number of ribs of course may be provided to secure the desired frictional engagement of the packi-ng with the walls of the container'. The elastic packing is in the form of a cap and is provided with a transverse end portion which extends over the lower end oi the packing receiving portion of the core. The lower packing receiving portion of the core is Yreduced. in diameter to provide an intershoulder 56v against whichuthe upper edge of the packing abuts. The hollow uppery portion of the core provides a socket to receive the neck 47 which forms a shank for the operating member or piston rod and the said core is interiorly threaded. at 57 to engageY the threads 48 of the neck or shank portion of the operating member or piston rod. The core is provided at its hollow upper portion with the puncturing needle or point 50 which is formed integral with the core and which depends upwardly. The puncturing needle whichv is centrally arranged is provided with a 'longitudinal bore forming a continuation of. the bore 58 and providing a passageV for the'liquidl contents of the ampuleV which constitutes the operating member or piston rod.

The elastic cap is provided with a valve formed by a perforation-59 arranged eccentrically of the transverse portion of the elastic packing. When the Vpassage 60 through the nipple 61 of the hypodermic piston barrel 46 is closed and the piston is moved upwardly or outwardlythe suction will cause the elastic Vportion of the packing to move away from the lower end of the core 53 and the liquid contents of the ampule will new downwardly through the passage 58 .and

through` the perfo-ration 59 into the container 46 and a downward. movement of the piston will expel the liquid contents oi' the arrel'v 46 therefrom. The anipnleA 45 whic` f constitutes the operating member or piston rod is adapted to be readily connected with and disconnected from the piston head in the same manneras the piston rods or operating members heretofore described.

What I claim is: f

`1. A hypodermic syringe including a container, a piston rod, a threaded coupling portion carried by the piston rod and a piston head arranged in the container and forming a stopper closure for the same and comprising a core having a threaded socket receiving and detachably engaging the said threaded coupling portion, and an elastic packing consisting'oi a sleeve of substantially uniform thickness throughout extending upwardly from the lower end of the core and encasing the lower portion of said co-re and contacting with the walls of the container.

2. A hypodermic syringe including a container, a piston rod, a threaded coupling portion carried by the piston rod and a piston head arranged in the container and forming a stopper closure for the same and comprising a core having a threaded socket receiving and engaging the said threaded portion, said core being also pro-vided with an exterior annular rib, and an elastic packing arranged on the core and havingA an annular protuberance formed by the said rib and contacting vwith the walls of the container..

3. A hypodermic syringe including a container, a piston rod, a piston head arranged within the container and comprising a core, an elastic packing arranged on the core and forming a closure for the core and a puncturing point or needle carried by the piston and arranged to puncture the closure of thel sleeve. A

4'. A hypodermic syringe including a container, a piston rod, a piston head arranged within the container and forming a stopper closurek for the same and comprising a core, said core and piston rod having cooperating meansvfor detachably connecting the piston rod with the piston head, an elastic packing consisting oi a cap tted on the core and having a transverse portion extending across the 'end' of the same and a'puncturing point or needle carried by the piston and arranged to puncture the transverse portion Vof the elastic packing when the piston rod is connected with the piston head.

5. A hypodermic syringe including a con` tainer, a piston rod, a piston head arranged within the container and :forming a stopper closure for the same and comprising a core, Said core and piston rod having cooperating means for detachably connecting the piston rod with the piston head, an elastic packing arrangedl onI the core and consisting of'a cap having a transverse'portion extending across theend ci the sleeve and projetcing intothe saine and a puncturing point or needle carried by the piston rod and arranged to pierce the projecting port-ion of the elastic packing.

'6. A hypodermic syringe including a container, a piston rod, a piston head arranged within the container and forming a stopper closure for the same and comprising a core, said core and piston rod having cooperating means for detachably connecting the piston sul kals

rod with the piston head, an'elastic packing consisting of a cap arranged on the core andk tion and provided with a bore, a coupling member having interiorly and eXteriorlyV threaded portions the interiorly :threaded po-rtion receiving the threaded portion of the piston rod, said coupling member being also provided with a bore and having a hollow puncturing needle communicating with thel bore of the coupling member and a piston head consisting of a sleeve interiorly threaded to receive the threaded portion of the coupling m'ember and an elastic packing conn sisting of a cap fitted on. the sleeve and having a transverse portion'extending across the end of the same and arranged to be punctured by the said needle or point.

8. A hypodermic syringe including a container, a piston rod having a bore and provided with a lower threaded end having a reduced terminal projecting portion, a coupling member having interiorly and exterior-v ly threaded portions, the interio-rly threaded portion receiving the threaded portion of the Diston rod, said interiorly threaded portion having a substantially conical bottom with .which the said reduced portion contacts, said coupling member being also provided with a Vbore and having a hollow puncturing needle communicating with the said bore of the coupling member and a piston head comprising a sleeve interiorly threaded to receive the threaded portion of the coupling member and an elastic packing consisting of a cap itted on the sleeve and arranged to be punctured by the needle when thefcoupling member is connected with the piston head.

9. A syringe including a cylindrical contaner, a combination piston rod and container, a piston head arrangedwithin the cylinder container and forming a stopper closure for the same, said combination piston rod and container having cooperating means for detachably and rigidly connecting the'combination piston rod and container with the piston head, one of said parts having a projecting puncturing needle and the other part being provided with a portion adapted to be punctured by the projecting puncturing needle. y

In testimony whereof I have hereunto set m hand. p

y GEORGE N. HEIN. 

